Saving NSString with writeToFile will only save to one location - objective-c

Using the code below is the only way I can get writeToFile to actually save a file. It outputs to this directory:
/Users/Eric/Library/Containers/net.ericmann.Event-Gadget-Workshop-App/Data/Documents/gadget.ics
- (IBAction)Saved:(id)sender {
[self writeToTextFile];
//mySaved.stringValue = [NSString stringWithFormat:#"Saved!"];
}
-(void) writeToTextFile{
//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//NSString *pathToDesktop = [NSString stringWithFormat:#"/Users/%#/Desktop", NSUserName()];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/gadget.ics", documentsDirectory];
//create content - four lines of text
NSString *content = myOutput.stringValue;
//save content to the documents directory
[content writeToFile:fileName atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil];
mySaved.stringValue = fileName;
myTestBox.stringValue = fileName;
}
Now, if I use the code below, nothing will write. I have the test file name output, and it's pointing here:
/Users/Eric/Desktop/gadget.ics
-(void) writeToTextFile{
//get the documents directory:
// NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
//NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pathToDesktop = [NSString stringWithFormat:#"/Users/%#/Desktop", NSUserName()];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/gadget.ics", pathToDesktop];
//create content - four lines of text
NSString *content = myOutput.stringValue;
//save content to the documents directory
[content writeToFile:fileName atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil];
mySaved.stringValue = fileName;
myTestBox.stringValue = fileName;

You will likely end up figuring out a solution if you actually make use of the error parameter there in the "writeToFile" method:
e.g.:
NSError * error = NULL;
BOOL success = [content writeToFile:fileName atomically:NO encoding:NSUTF8StringEncoding error:&error];
if(success == NO)
{
NSLog( #"error saving to %# - %#", fileName, [error localizedDescription] );
}

Related

How to save and load multiple photos into my local app in Objective C?

-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
image=[info objectForKey:UIImagePickerControllerOriginalImage];
[self.images addObject:image];
[self.maintable reloadData];
[self dismissViewControllerAnimated:YES completion:NULL];
}
-(IBAction)savebutton:(id)sender{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory ,
NSUserDomainMask , YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat: #"MyImages"]];
for (int i=0; i<_images.count; i++) {
image=[_images objectAtIndex:i];
NSData* data = UIImagePNGRepresentation(image);
[data writeToFile:path atomically:YES];
NSLog(#"saved");
}
}
- (UIImage*)loadImage
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);`
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat: #"MyImage.png"] ];
image = [UIImage imageWithContentsOfFile:path];
if(image != nil){
[self.images addObject:image];
}
return image;
}
You are on correct track,
On save button action, save images document directory's particular path and save image name in one array which you need to save in core data or preference whatever you preferred in your app
like this..
NSString *strImageName = #"image.png"
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString *filePath = [documentsPath stringByAppendingPathComponent: strImageName];
// Above you can give your custom path like #"App_Name/imageName" for unique identification
[pngData writeToFile:filePath atomically:YES];
[arrCoreData addObject: strImageName];
Once you have done(saved all your images then save image name in preference)
like this
NSData *data = [NSKeyedArchiver archivedDataWithRootObject: arrCoreData];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:#"MyImageArray"];
When you want to fetch images and display it again,
You may follow this flow:
NSData *mainCatData = [[NSUserDefaults standardUserDefaults] objectForKey:#"MyImageArray"];
arrCoreData = [NSKeyedUnarchiver unarchiveObjectWithData:mainCatData];
Then using these images name you may fetch images back and display as you want..
To load image from document directory, You may use this function
- (UIImage*)loadImage:(NSString)strImageName{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithString: #"AppName/%#", strImageName] ];
UIImage* image = [UIImage imageWithContentsOfFile:path];
return image;
}
Hope it will help you :)
I did it and worked on my app:)
- (void)loadImage
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSArray *fileArray = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:nil];
for (int i=0; i<fileArray.count; i++) {
NSString* path = [documentsDirectory stringByAppendingPathComponent:fileArray[i]];
image = [UIImage imageWithContentsOfFile:path];
[self.images addObject:image];
}
}
-(IBAction)savebutton:(id)sender{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask , YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
for (int i=0; i<_images.count; i++) {
NSString* path = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat: #"MyImages%d", i]];
image=[_images objectAtIndex:i];
NSData* data = UIImagePNGRepresentation(image);
[data writeToFile:path atomically:YES];
NSLog(#"saved");
}
}

How to write all known time zone names in Objective-C to a file

I'm trying to get a file which contains, on separate lines, all the time zone names contained in the knownTimeZoneNames variable of the NSTimeZone class. I'm quite new to Objective-C, though; here is what I've tried so far:
#import <Foundation/Foundation.h>
#import <stdio.h>
int main(void)
{
FILE *fp;
fp = fopen("knownTimeZoneNames.txt", "w+");
for (NSTimeZone* timezone in [NSTimeZone knownTimeZoneNames]) {
fputs(timezone, fp);
}
fclose(fp);
return 0;
}
The problem is that the file I get does not seem to be human-readable. What would be the correct way to do this?
Take your string write to file.
//Method writes a string to a text file
-(void) writeToTextFile{
//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/textfile.txt",
documentsDirectory];
//create content - four lines of text
NSString *content = #"One\nTwo\nThree\nFour\nFive";
//save content to the documents directory
[content writeToFile:fileName
atomically:NO
encoding:NSStringEncodingConversionAllowLossy
error:nil];
}
//Method retrieves content from documents directory and
//displays it in an alert
-(void) displayContent{
//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/textfile.txt",
documentsDirectory];
NSString *content = [[NSString alloc] initWithContentsOfFile:fileName
usedEncoding:nil
error:nil];
//use simple alert from my library (see previous post for details)
[ASFunctions alert:content];
[content release];
}

Save locally generated PDF to app's documents folder in iOS8

It would seem that my apps no longer are able to save files to their documents folder when doing this:
NSString *path = [documentsDirectory stringByAppendingPathComponent:fileName];
NSData *dta = [[NSData alloc] init];
dta = [NSData dataWithContentsOfFile:path];
NSLog(#"writing file: %#", path);
if ([dta writeToFile:path options:NSAtomicWrite error:nil] == NO) {
NSLog(#"writeToFile error");
}else {
NSLog(#"Written: %#", path);
[self addSkipBackupAttributeToItemAtURL:[NSURL fileURLWithPath:path]];
}
I do get "Written" in the log with the full path:
Written: /var/mobile/Containers/Data/Application/ECBCD65D-A990-4758-A07F-ECE48E269278/Documents/9d440408-4758-4219-9c9c-12fe69cf82f2_pdf.pdf
And as long as I don't quit the app I can load the PDF in a UIWebView like this (pdfPath is a string that I pass to the function that loads the PDF file):
[www loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:pdfPath]]];
Any help at all is as always greatly appreciated.
Okay, after mucking about I found that since the documents directory changes path every time I run the app, I had to:
Write the file to the documents folder with the complete path to
the file:
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask ,YES );
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent: fileName];
NSData *dta = [[NSData alloc] init];
dta = [NSData dataWithContentsOfFile:path];
if ([dta writeToFile:path options:NSAtomicWrite error:nil] == NO) {
NSLog(#"writeToFile error");
}else {
NSLog(#"Written: %#", path);
[self addSkipBackupAttributeToItemAtURL:[NSURL fileURLWithPath:path]];
}
Save only the file name to my database
Load the file by using the full newly generated Documents directory path and append the file name from my database:
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent: pdfPath];

Using both NSApplicationSupportDirectory and NSDocumentDirectory

Here is the deal... I am creating an app (from another one of my apps) but I am altering to from using only the NSDocumentDirectory, which obviously allows the user to see all of the user files, to seeing only a few of the files... namely user created PDFs.
I have it working... but, nothing shows in the FileSharing/Documents window in iTunes.
First are the methods that invoke the NSApplicationSupportDirectory in the persistence model...
+(NSString *)getDocumentpath
{
//NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
return [paths objectAtIndex:0];
}
+(NSString *) documentsDirectoryPath
{
//NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return documentsDirectory;
}
+(void) copyResourceFileToDocumentsDirectory: (NSString *) fileName
{
//NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writablePath = [documentsDirectory stringByAppendingPathComponent:fileName];
NSFileManager * fileManager = [NSFileManager defaultManager];
BOOL succeeded = [fileManager fileExistsAtPath:writablePath];
NSError *error;
//If file is not in the documents directory then only write
if (!succeeded)
{
NSString *newPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:fileName];
succeeded = [fileManager copyItemAtPath:newPath toPath:writablePath error:&error];
if (succeeded == FALSE) {
NSLog(#"%# : copy failed", fileName);
} else {
NSLog(#"%# : copy success", fileName);
}
} else {
NSLog(#"%# : already exists", fileName);
}
}
This is the method for saving the PDF into the NSDocumentDirectory, which has not been changed from the other app...
- (NSString*)saveJournalToPDF:(UIView*)journal andName:(NSString*)name
{
NSString* fileName = [NSString stringWithFormat:#"%#.pdf",name];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:fileName];
... // the rest of the data strings for creating the PDF
}
My question: how do I get ONLY the PDFs to be visible to the user without exposing the other data files? Right now, it seems that it is either all or nothing!
I neglected one small detail... setting the app to actually share files! The app's info.plist did not have "Application supports iTunes file sharing" set to YES. (UIFileSharingEnabled). Such a simple fix!!!

iPad app - generating text file

Can someone explain and give example code to do the following steps in my iPad app:
do some things in my app, which generates some data (as a string)
write that data to a text file
be able to plug in my iPad to my computer and grab those text files off
How can I do this?
For writing string in a file use this
NSString *str = #"your string";
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* documentsDirectory = [paths objectAtIndex:0];
NSString* filePath = [documentsDirectory stringByAppendingPathComponent:#"data.txt"];
NSError *error;
[str writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error];
Then set Application supports iTunes file sharing key to YES in your plist file.
When you connect your device with iTunes from there you can save your data.txt
Here is the video how to get files from iTunes
Edited as requested.
NSUserDefaults *deflt = [NSUserDefaults standardUserDefaults];
//this number file is saved, I'm not saving the file name as data0.txt.
//The first file to be saved is data1.txt
int num = [deflt integerForKey:#"fileNameNum"];
num++;
NSString *fileName = [NSString stringWithFormat:#"data%d.txt",num];;
NSString *str = #"your string";
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* documentsDirectory = [paths objectAtIndex:0];
NSString* filePath = [documentsDirectory stringByAppendingPathComponent:fileName];
NSError *error = nil;
[str writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error];
if (error == nil) {
//Save the number of the file that you have save in doc directory
[deflt setInteger:num forKey:#"fileNameNum"];
}